| /* |
| * Copyright 2014 Open Networking Laboratory |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| package org.onlab.onos.ifwd; |
| |
| import org.apache.felix.scr.annotations.Activate; |
| import org.apache.felix.scr.annotations.Component; |
| import org.apache.felix.scr.annotations.Deactivate; |
| import org.apache.felix.scr.annotations.Reference; |
| import org.apache.felix.scr.annotations.ReferenceCardinality; |
| import org.onlab.onos.core.ApplicationId; |
| import org.onlab.onos.core.CoreService; |
| import org.onlab.onos.net.Host; |
| import org.onlab.onos.net.HostId; |
| import org.onlab.onos.net.PortNumber; |
| import org.onlab.onos.net.flow.DefaultTrafficSelector; |
| import org.onlab.onos.net.flow.DefaultTrafficTreatment; |
| import org.onlab.onos.net.flow.TrafficSelector; |
| import org.onlab.onos.net.flow.TrafficTreatment; |
| import org.onlab.onos.net.host.HostService; |
| import org.onlab.onos.net.intent.HostToHostIntent; |
| import org.onlab.onos.net.intent.IntentService; |
| import org.onlab.onos.net.packet.DefaultOutboundPacket; |
| import org.onlab.onos.net.packet.InboundPacket; |
| import org.onlab.onos.net.packet.OutboundPacket; |
| import org.onlab.onos.net.packet.PacketContext; |
| import org.onlab.onos.net.packet.PacketProcessor; |
| import org.onlab.onos.net.packet.PacketService; |
| import org.onlab.onos.net.topology.TopologyService; |
| import org.onlab.packet.Ethernet; |
| import org.slf4j.Logger; |
| |
| import static org.slf4j.LoggerFactory.getLogger; |
| |
| /** |
| * WORK-IN-PROGRESS: Sample reactive forwarding application using intent framework. |
| */ |
| @Component(immediate = true) |
| public class IntentReactiveForwarding { |
| |
| private final Logger log = getLogger(getClass()); |
| |
| @Reference(cardinality = ReferenceCardinality.MANDATORY_UNARY) |
| protected CoreService coreService; |
| |
| @Reference(cardinality = ReferenceCardinality.MANDATORY_UNARY) |
| protected TopologyService topologyService; |
| |
| @Reference(cardinality = ReferenceCardinality.MANDATORY_UNARY) |
| protected PacketService packetService; |
| |
| @Reference(cardinality = ReferenceCardinality.MANDATORY_UNARY) |
| protected IntentService intentService; |
| |
| @Reference(cardinality = ReferenceCardinality.MANDATORY_UNARY) |
| protected HostService hostService; |
| |
| private ReactivePacketProcessor processor = new ReactivePacketProcessor(); |
| private ApplicationId appId; |
| |
| @Activate |
| public void activate() { |
| appId = coreService.registerApplication("org.onlab.onos.ifwd"); |
| packetService.addProcessor(processor, PacketProcessor.ADVISOR_MAX + 2); |
| log.info("Started"); |
| } |
| |
| @Deactivate |
| public void deactivate() { |
| packetService.removeProcessor(processor); |
| processor = null; |
| log.info("Stopped"); |
| } |
| |
| /** |
| * Packet processor responsible for forwarding packets along their paths. |
| */ |
| private class ReactivePacketProcessor implements PacketProcessor { |
| |
| @Override |
| public void process(PacketContext context) { |
| // Stop processing if the packet has been handled, since we |
| // can't do any more to it. |
| if (context.isHandled()) { |
| return; |
| } |
| |
| InboundPacket pkt = context.inPacket(); |
| Ethernet ethPkt = pkt.parsed(); |
| |
| HostId srcId = HostId.hostId(ethPkt.getSourceMAC()); |
| HostId dstId = HostId.hostId(ethPkt.getDestinationMAC()); |
| |
| // Do we know who this is for? If not, flood and bail. |
| Host dst = hostService.getHost(dstId); |
| if (dst == null) { |
| flood(context); |
| return; |
| } |
| |
| // Otherwise forward and be done with it. |
| setUpConnectivity(context, srcId, dstId); |
| forwardPacketToDst(context, dst); |
| } |
| } |
| |
| // Floods the specified packet if permissible. |
| private void flood(PacketContext context) { |
| if (topologyService.isBroadcastPoint(topologyService.currentTopology(), |
| context.inPacket().receivedFrom())) { |
| packetOut(context, PortNumber.FLOOD); |
| } else { |
| context.block(); |
| } |
| } |
| |
| // Sends a packet out the specified port. |
| private void packetOut(PacketContext context, PortNumber portNumber) { |
| context.treatmentBuilder().setOutput(portNumber); |
| context.send(); |
| } |
| |
| private void forwardPacketToDst(PacketContext context, Host dst) { |
| TrafficTreatment treatment = DefaultTrafficTreatment.builder().setOutput(dst.location().port()).build(); |
| OutboundPacket packet = new DefaultOutboundPacket(dst.location().deviceId(), |
| treatment, context.inPacket().unparsed()); |
| packetService.emit(packet); |
| log.info("sending packet: {}", packet); |
| } |
| |
| // Install a rule forwarding the packet to the specified port. |
| private void setUpConnectivity(PacketContext context, HostId srcId, HostId dstId) { |
| TrafficSelector selector = DefaultTrafficSelector.builder().build(); |
| TrafficTreatment treatment = DefaultTrafficTreatment.builder().build(); |
| |
| HostToHostIntent intent = new HostToHostIntent(appId, srcId, dstId, |
| selector, treatment); |
| |
| intentService.submit(intent); |
| } |
| |
| } |